Chased an injector knock for 8 hours before I found the real issue

Turned out to be a cracked fuel return line letting air in, not even the injector itself. Has anyone else had a simple fix hide behind a loud symptom like that?

3 comments

3 Comments

wesley8319d ago

Used to be the type to immediately throw parts at a loud symptom, especially injector knock. Always figured it had to be the injector itself making that racket. This kind of thing changed my mind though, now I always double check the simple stuff first. A cracked line letting in air is a nightmare to track down but costs nothing to fix.

baker.ben19d ago

You ever notice how that approach applies to way more than just cars @wesley83? I've caught myself doing the same thing with appliances around the house. When the fridge started making this grinding noise my first thought was compressor and a huge repair bill. Turned out it was just a loose fan blade hitting the back panel. Tightened it up with a screwdriver and it's been quiet for years. It's like our brains are wired to jump straight to the worst case scenario instead of taking five minutes to look at the simple stuff first.

grant72815d ago

My buddy's 2005 F-250 had the exact same thing, a cracked return line that sounded just like an injector was dying. We spent a whole weekend swapping parts before we caught it. I mean, I get why people jump to the worst case with injector knock because it's so distinct and scary sounding, but honestly, I think sometimes chasing the simple stuff first can waste just as much time if you're not methodical about it. Maybe it's just me but idk, I'd rather spend the first hour ruling out the injectors with a known good spare or a compression test than blindly hunting for an air leak that might not even be there. It's all a gamble until you actually see the problem.